Chemical Forums
Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: joemok on April 07, 2007, 01:34:57 PM
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From Whiki, i see that only aldehyde or ketone have reactions with 2,4-dinitrophenylhydrazine.
It explains the inactivity of carboxylic acids, amides, and esters by resonance.
How about acid chloride and acid anhydride? They seem not to be resonance stabilized.
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first: you do have a weak +M from the Cl in an acid chloride and from the O in an anhydride
second: with acid derivatives you'd expect a substitution (product hydrazide) and not a condensation (leading to hydrazone)